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From: Dmitry Vyukov <dvyukov@google.com>
Date: Fri, 10 Jun 2016 15:06:08 +0200
Message-ID: <CACT4Y+ZQZKd=a=F2CF4seh-DpCRTT8aHjA21Xq3dSgg8g3U0kg@mail.gmail.com>
Subject: Re: x86: bad pte in pageattr_test
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        "x86@kernel.org" <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Konstantin Khlebnikov <koct9i@gmail.com>,
        syzkaller <syzkaller@googlegroups.com>,
        Kostya Serebryany <kcc@google.com>,
        Alexander Potapenko <glider@google.com>,
        Sasha Levin <sasha.levin@oracle.com>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        Peter Zijlstra <peterz@infradead.org>
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On Fri, Jun 10, 2016 at 2:54 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
> On Fri, 10 Jun 2016, Dmitry Vyukov wrote:
>> Here is the second log:
>> https://gist.githubusercontent.com/dvyukov/dd7970a5daaa7a30f6d37fa5592b56de/raw/f29182024538e604c95d989f7b398816c3c595dc/gistfile1.txt
>>
>> I've hit only twice. The first time I tried hard to reproduce it, with
>> no success. So unfortunately that's all we have.
>>
>> Re logs: my setup executes up to 16 programs in parallel. So for
>> normal BUGs any of the preceding 16 programs can be guilty. But since
>> this check is asynchronous, it can be just any preceding program in
>> the log.
>
> Ok.
>
>> I would expect that it is triggered by some rarely-executing poorly
>> tested code. Maybe mmap of some device?
>
> That's the mmap(dev) list which is common between the two log files:
>
> vcsn
> ircomm
> rfkill
> userio
> dspn
> mice
> midi
> sndpcmc
> hidraw0
> vga_arbiter
> lightnvm
> sr
>
> Dunno, if that's the right direction, but exposing these a bit more might be
> worth to try.


I am now running both of these logs for several hours (2.5M
executions). No failures so far...